After messing around with the console, I find three things would be awesome in a trainer. I included the best way to find those values.
1. XP for current hero
(Take the monarch patrolling, hunting or sailing for an easy to find value)
2. Hyperfocus, focus bar always maxed
(Focus is the sum of all moodlets, take a passive trait like being alone or being in nature, then go to the forest to fulfill it. With testingcheatsenabled and CTRL+Click on the moodlet you can easily remove the focus, it will pop back up a few seconds later, enough to search for a value difference)
3. Performance bar never degrades, allows us freeplay during quests
(QPerformance changes almost all the time as long as there are moodlets, I have no idea what the best way to find that value is)
Good ideas, and there are also others.
I don't know why they are taking so long to update that trainer, The Sims is an important title.